Page 185 - Mirjam-Theelen-Degradation-of-CIGS-solar-cells

Degradation mechanisms of the aluminium doped zinc oxide front contact

Table 6.2 Summary of deposition conditions and initial material properties of the
sputtered ZnO:Al layers.

Grain size Length scale Roughness
Sample Deposition time Thickness (surface) grains (R a ) *
RT 50 min 620 nm 0.009 μm 2 97 nm 1.8±0.6 nm

200 C 50 min 490 nm 0.013 μm 2 113 nm 2.6±1.2 nm
o

500 nm
(a) (b) (c) (d)
Figure 6.2
HIM pictures of helium etched samples ; (a) RT sample before degradation; (b) RT sample after degradation;
(c) 200 C sample before degradation; (d) 200 C sample after degradation.
o
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RT 200°C

Before

After

Figure 6.3
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HIM pictures of the cross-sections of RT and 200 C samples before and after exposure to 85 C/85% RH.
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